Accession Number : ADA114238

Title :   The Effect of Strain upon the Velocity of Sound and the Velocity of Free Retraction for Natural Rubber.

Descriptive Note : Technical rept.,


Personal Author(s) : Gent,A N ; Marteny,P

PDF Url : ADA114238

Report Date : May 1982

Pagination or Media Count : 28

Abstract : Measurements have been made of the velocity of sound and the velocity of free retraction for stretched strips of vulcanized natural rubber. Both of these velocities are found to increase markedly with increasing strain, in agreement with earlier work. The velocity of sound is shown to be related to the appropriate modulus of elasticity, defined by the slope of the curve relating true stress to tensile strain. Values obtained range from about 50 to about 800 m/s. The effects of prior stretching and of stress relaxation on the velocity of sound are shown to arise from corresponding changes in the modulus of elasticity at a given strain. The velocity of free retraction is shown to be directly related to the velocity of sound in the stretched strip, and to the imposed tensile strain, increasing from zero up to about 100 m/s at high strains. (Author)

Descriptors :   *Natural rubber, *Strain(Mechanics), *Velocity, Sound, Stress relaxation, Retractable, Modulus of elasticity, Stresses, Tensile properties, Strain rate, Measurement

Subject Categories : Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE